Q: What is the sum of all factors of the number 3,978 excluding 3,978?
A: 5,850
The factors of the number 3,978 are: 1, 2, 3, 6, 9, 13, 17, 18, 26, 34, 39, 51, 78, 102, 117, 153, 221, 234, 306, 442, 663, 1326, 1989, 3978.
If you add them up, you will get the total of 3,983. Now subtract 3,978 to get 5,850